1.25113:3=8371
2.36985:5=7397
3.8371+7397=15768
1.568972-559423=9549
2.14:7=2
3.9549*2=19098
15768меньше19098
1.25:10=2.5
2.256897+3564=260461
3.260461*2.5=651152,5
19098меньше651152,5
1)sin (11+34)/sin11×sin34= sin45/sin11×sin34= √(2)/ 2 (sin11×sin34)
3) sin (20-50)/sin50×sin20= -sin30/sin50×sin20= -1/2 (sin50×sin20)
Если правильно понял, то так:
б) -
![\frac{r}{14}](https://tex.z-dn.net/?f=+%5Cfrac%7Br%7D%7B14%7D+)
=
![\frac{8}{3}](https://tex.z-dn.net/?f=+%5Cfrac%7B8%7D%7B3%7D+)
*
![\frac{3r}{112}](https://tex.z-dn.net/?f=+%5Cfrac%7B3r%7D%7B112%7D+)
г)
![\frac{2 a^{2}c }{7} = \frac{8}{3} * \frac{3 a^{2}c }{28}](https://tex.z-dn.net/?f=+%5Cfrac%7B2+a%5E%7B2%7Dc+%7D%7B7%7D+%3D+%5Cfrac%7B8%7D%7B3%7D+%2A+%5Cfrac%7B3+a%5E%7B2%7Dc+%7D%7B28%7D+)
е)
![\frac{s^{2} t^{3} }{3}](https://tex.z-dn.net/?f=++%5Cfrac%7Bs%5E%7B2%7D+t%5E%7B3%7D++%7D%7B3%7D+)
=
![\frac{8}{3}](https://tex.z-dn.net/?f=+%5Cfrac%7B8%7D%7B3%7D+)
*
![\frac{ s^{2} t^{3}}{8}](https://tex.z-dn.net/?f=+%5Cfrac%7B+s%5E%7B2%7D+t%5E%7B3%7D%7D%7B8%7D+)
з)-
![\frac{123l}{420} = \frac{41l}{140} = \frac{8}{3}* \frac{121l}{140*8}](https://tex.z-dn.net/?f=+%5Cfrac%7B123l%7D%7B420%7D+%3D+%5Cfrac%7B41l%7D%7B140%7D+%3D+%5Cfrac%7B8%7D%7B3%7D%2A+%5Cfrac%7B121l%7D%7B140%2A8%7D+)
( 1,75-1/2)*8+50,4:9=15,6
1,75-1/2=1,75-0,5=1,25
1,25*8=10
50,4÷9=5,6
10+5,6=15,6